Question

X = 5 cos t, y = 5 sin t
Eliminate the perameter

Answer 1

`\bf \begin{cases} x=5cos(t)\implies (x)/(5)=cos(t)\\\\ cos^(-1)\left( (x)/(5) \right)=cos^(-1)[cos(t)]\\\\ cos^(-1)\left( (x)/(5) \right)=\boxed{t}\\ ----------\\ y=5sin(t)\implies y=5sin\left( \boxed{cos^(-1)\left( (x)/(5) \right)} \right) \end{cases}`

just a matter of substitution